초록 ▼

A simple system is provided for lifting ejector pins in sequence, as a knockout piston (30) is raised. First and second ejector pins (40, 42) have lower ends respectively supported on first and second ejectors (70, 72) that each can move vertically, with the second ejector lying below the first one.

A simple system is provided for lifting ejector pins in sequence, as a knockout piston (30) is raised. First and second ejector pins (40, 42) have lower ends respectively supported on first and second ejectors (70, 72) that each can move vertically, with the second ejector lying below the first one. The second ejector has a vertical through-hole (74), and a force member (80) lies within the hole and can project both above and below the hole. As the knockout piston is moved up, it first engages the bottom of the force member to push it up, so the force member pushes up the first ejector and first ejector pin, while the second ejector and second ejector pin do not move. The top (84) of the knockout piston is wider than the hole, so when the piston reaches the bottom of the second ejector, it then begins to lift the second ejector and second ejector pin. The force member can be a cam pivotally mounted on the second ejector, or can be a shaft that moves vertically.

대표청구항 ▼

[What is claimed is:] [1.]a cavity plate forming a mold cavity with a pair of ejector pin-receiving apertures;first and second ejectors that are independently vertically moveable, with said injectors both lying under said cavity plate, with said second ejector lying under said first ejector, and wit

[What is claimed is:] [1.]a cavity plate forming a mold cavity with a pair of ejector pin-receiving apertures;first and second ejectors that are independently vertically moveable, with said injectors both lying under said cavity plate, with said second ejector lying under said first ejector, and with said second ejector having a primarily vertical through hole;first and second ejector pins having lower ends supported respectively on said first and second ejectors and having upper ends lying in said apertures of said cavity plate;a force member moveably mounted in said hole, said force member having a lower end lying directly over a first portion of said knockout piston so said force member is moved up when said knockout piston moves up, and said force member having an upper end lying directly under said first ejector to move up said first ejector and said first ejector pin;said force member having a vertical height between said upper and lower ends which is greater than the vertical height of said hole in said second ejector, so said force member lower end can lie below the bottom of said hole and can be moved up by said knockout piston while said force member upper end moves up said first ejector, without moving up said second ejector;said second ejector having a portion positioned in line with said knockout piston to be pushed up by said knockout piston after said force member has been moved up a predetermined distance.